net/ethtool/netlink.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include <net/sock.h>
   4 #include <linux/ethtool_netlink.h>
   5 #include "netlink.h"
   6
   7 static struct genl_family ethtool_genl_family;
   8
   9 static bool ethnl_ok __read_mostly;
  10 static u32 ethnl_bcast_seq;
  11
  12 static const struct nla_policy ethnl_header_policy[ETHTOOL_A_HEADER_MAX + 1] = {
  13         [ETHTOOL_A_HEADER_UNSPEC]       = { .type = NLA_REJECT },
  14         [ETHTOOL_A_HEADER_DEV_INDEX]    = { .type = NLA_U32 },
  15         [ETHTOOL_A_HEADER_DEV_NAME]     = { .type = NLA_NUL_STRING,
  16                                             .len = ALTIFNAMSIZ - 1 },
  17         [ETHTOOL_A_HEADER_FLAGS]        = { .type = NLA_U32 },
  18 };
  19
  20 /**
  21  * ethnl_parse_header() - parse request header
  22  * @req_info:    structure to put results into
  23  * @header:      nest attribute with request header
  24  * @net:         request netns
  25  * @extack:      netlink extack for error reporting
  26  * @require_dev: fail if no device identified in header
  27  *
  28  * Parse request header in nested attribute @nest and puts results into
  29  * the structure pointed to by @req_info. Extack from @info is used for error
  30  * reporting. If req_info->dev is not null on return, reference to it has
  31  * been taken. If error is returned, *req_info is null initialized and no
  32  * reference is held.
  33  *
  34  * Return: 0 on success or negative error code
  35  */
  36 int ethnl_parse_header(struct ethnl_req_info *req_info,
  37                        const struct nlattr *header, struct net *net,
  38                        struct netlink_ext_ack *extack, bool require_dev)
  39 {
  40         struct nlattr *tb[ETHTOOL_A_HEADER_MAX + 1];
  41         const struct nlattr *devname_attr;
  42         struct net_device *dev = NULL;
  43         int ret;
  44
  45         if (!header) {
  46                 NL_SET_ERR_MSG(extack, "request header missing");
  47                 return -EINVAL;
  48         }
  49         ret = nla_parse_nested(tb, ETHTOOL_A_HEADER_MAX, header,
  50                                ethnl_header_policy, extack);
  51         if (ret < 0)
  52                 return ret;
  53         devname_attr = tb[ETHTOOL_A_HEADER_DEV_NAME];
  54
  55         if (tb[ETHTOOL_A_HEADER_DEV_INDEX]) {
  56                 u32 ifindex = nla_get_u32(tb[ETHTOOL_A_HEADER_DEV_INDEX]);
  57
  58                 dev = dev_get_by_index(net, ifindex);
  59                 if (!dev) {
  60                         NL_SET_ERR_MSG_ATTR(extack,
  61                                             tb[ETHTOOL_A_HEADER_DEV_INDEX],
  62                                             "no device matches ifindex");
  63                         return -ENODEV;
  64                 }
  65                 /* if both ifindex and ifname are passed, they must match */
  66                 if (devname_attr &&
  67                     strncmp(dev->name, nla_data(devname_attr), IFNAMSIZ)) {
  68                         dev_put(dev);
  69                         NL_SET_ERR_MSG_ATTR(extack, header,
  70                                             "ifindex and name do not match");
  71                         return -ENODEV;
  72                 }
  73         } else if (devname_attr) {
  74                 dev = dev_get_by_name(net, nla_data(devname_attr));
  75                 if (!dev) {
  76                         NL_SET_ERR_MSG_ATTR(extack, devname_attr,
  77                                             "no device matches name");
  78                         return -ENODEV;
  79                 }
  80         } else if (require_dev) {
  81                 NL_SET_ERR_MSG_ATTR(extack, header,
  82                                     "neither ifindex nor name specified");
  83                 return -EINVAL;
  84         }
  85
  86         if (dev && !netif_device_present(dev)) {
  87                 dev_put(dev);
  88                 NL_SET_ERR_MSG(extack, "device not present");
  89                 return -ENODEV;
  90         }
  91
  92         req_info->dev = dev;
  93         if (tb[ETHTOOL_A_HEADER_FLAGS])
  94                 req_info->flags = nla_get_u32(tb[ETHTOOL_A_HEADER_FLAGS]);
  95
  96         return 0;
  97 }
  98
  99 /**
 100  * ethnl_fill_reply_header() - Put common header into a reply message
 101  * @skb:      skb with the message
 102  * @dev:      network device to describe in header
 103  * @attrtype: attribute type to use for the nest
 104  *
 105  * Create a nested attribute with attributes describing given network device.
 106  *
 107  * Return: 0 on success, error value (-EMSGSIZE only) on error
 108  */
 109 int ethnl_fill_reply_header(struct sk_buff *skb, struct net_device *dev,
 110                             u16 attrtype)
 111 {
 112         struct nlattr *nest;
 113
 114         if (!dev)
 115                 return 0;
 116         nest = nla_nest_start(skb, attrtype);
 117         if (!nest)
 118                 return -EMSGSIZE;
 119
 120         if (nla_put_u32(skb, ETHTOOL_A_HEADER_DEV_INDEX, (u32)dev->ifindex) ||
 121             nla_put_string(skb, ETHTOOL_A_HEADER_DEV_NAME, dev->name))
 122                 goto nla_put_failure;
 123         /* If more attributes are put into reply header, ethnl_header_size()
 124          * must be updated to account for them.
 125          */
 126
 127         nla_nest_end(skb, nest);
 128         return 0;
 129
 130 nla_put_failure:
 131         nla_nest_cancel(skb, nest);
 132         return -EMSGSIZE;
 133 }
 134
 135 /**
 136  * ethnl_reply_init() - Create skb for a reply and fill device identification
 137  * @payload:      payload length (without netlink and genetlink header)
 138  * @dev:          device the reply is about (may be null)
 139  * @cmd:          ETHTOOL_MSG_* message type for reply
 140  * @hdr_attrtype: attribute type for common header
 141  * @info:         genetlink info of the received packet we respond to
 142  * @ehdrp:        place to store payload pointer returned by genlmsg_new()
 143  *
 144  * Return: pointer to allocated skb on success, NULL on error
 145  */
 146 struct sk_buff *ethnl_reply_init(size_t payload, struct net_device *dev, u8 cmd,
 147                                  u16 hdr_attrtype, struct genl_info *info,
 148                                  void **ehdrp)
 149 {
 150         struct sk_buff *skb;
 151
 152         skb = genlmsg_new(payload, GFP_KERNEL);
 153         if (!skb)
 154                 goto err;
 155         *ehdrp = genlmsg_put_reply(skb, info, &ethtool_genl_family, 0, cmd);
 156         if (!*ehdrp)
 157                 goto err_free;
 158
 159         if (dev) {
 160                 int ret;
 161
 162                 ret = ethnl_fill_reply_header(skb, dev, hdr_attrtype);
 163                 if (ret < 0)
 164                         goto err_free;
 165         }
 166         return skb;
 167
 168 err_free:
 169         nlmsg_free(skb);
 170 err:
 171         if (info)
 172                 GENL_SET_ERR_MSG(info, "failed to setup reply message");
 173         return NULL;
 174 }
 175
 176 static void *ethnl_bcastmsg_put(struct sk_buff *skb, u8 cmd)
 177 {
 178         return genlmsg_put(skb, 0, ++ethnl_bcast_seq, &ethtool_genl_family, 0,
 179                            cmd);
 180 }
 181
 182 static int ethnl_multicast(struct sk_buff *skb, struct net_device *dev)
 183 {
 184         return genlmsg_multicast_netns(&ethtool_genl_family, dev_net(dev), skb,
 185                                        0, ETHNL_MCGRP_MONITOR, GFP_KERNEL);
 186 }
 187
 188 /* GET request helpers */
 189
 190 /**
 191  * struct ethnl_dump_ctx - context structure for generic dumpit() callback
 192  * @ops:        request ops of currently processed message type
 193  * @req_info:   parsed request header of processed request
 194  * @reply_data: data needed to compose the reply
 195  * @pos_hash:   saved iteration position - hashbucket
 196  * @pos_idx:    saved iteration position - index
 197  *
 198  * These parameters are kept in struct netlink_callback as context preserved
 199  * between iterations. They are initialized by ethnl_default_start() and used
 200  * in ethnl_default_dumpit() and ethnl_default_done().
 201  */
 202 struct ethnl_dump_ctx {
 203         const struct ethnl_request_ops  *ops;
 204         struct ethnl_req_info           *req_info;
 205         struct ethnl_reply_data         *reply_data;
 206         int                             pos_hash;
 207         int                             pos_idx;
 208 };
 209
 210 static const struct ethnl_request_ops *
 211 ethnl_default_requests[__ETHTOOL_MSG_USER_CNT] = {
 212         [ETHTOOL_MSG_STRSET_GET]        = &ethnl_strset_request_ops,
 213         [ETHTOOL_MSG_LINKINFO_GET]      = &ethnl_linkinfo_request_ops,
 214         [ETHTOOL_MSG_LINKMODES_GET]     = &ethnl_linkmodes_request_ops,
 215         [ETHTOOL_MSG_LINKSTATE_GET]     = &ethnl_linkstate_request_ops,
 216         [ETHTOOL_MSG_DEBUG_GET]         = &ethnl_debug_request_ops,
 217         [ETHTOOL_MSG_WOL_GET]           = &ethnl_wol_request_ops,
 218 };
 219
 220 static struct ethnl_dump_ctx *ethnl_dump_context(struct netlink_callback *cb)
 221 {
 222         return (struct ethnl_dump_ctx *)cb->ctx;
 223 }
 224
 225 /**
 226  * ethnl_default_parse() - Parse request message
 227  * @req_info:    pointer to structure to put data into
 228  * @nlhdr:       pointer to request message header
 229  * @net:         request netns
 230  * @request_ops: struct request_ops for request type
 231  * @extack:      netlink extack for error reporting
 232  * @require_dev: fail if no device identified in header
 233  *
 234  * Parse universal request header and call request specific ->parse_request()
 235  * callback (if defined) to parse the rest of the message.
 236  *
 237  * Return: 0 on success or negative error code
 238  */
 239 static int ethnl_default_parse(struct ethnl_req_info *req_info,
 240                                const struct nlmsghdr *nlhdr, struct net *net,
 241                                const struct ethnl_request_ops *request_ops,
 242                                struct netlink_ext_ack *extack, bool require_dev)
 243 {
 244         struct nlattr **tb;
 245         int ret;
 246
 247         tb = kmalloc_array(request_ops->max_attr + 1, sizeof(tb[0]),
 248                            GFP_KERNEL);
 249         if (!tb)
 250                 return -ENOMEM;
 251
 252         ret = nlmsg_parse(nlhdr, GENL_HDRLEN, tb, request_ops->max_attr,
 253                           request_ops->request_policy, extack);
 254         if (ret < 0)
 255                 goto out;
 256         ret = ethnl_parse_header(req_info, tb[request_ops->hdr_attr], net,
 257                                  extack, require_dev);
 258         if (ret < 0)
 259                 goto out;
 260
 261         if (request_ops->parse_request) {
 262                 ret = request_ops->parse_request(req_info, tb, extack);
 263                 if (ret < 0)
 264                         goto out;
 265         }
 266
 267         ret = 0;
 268 out:
 269         kfree(tb);
 270         return ret;
 271 }
 272
 273 /**
 274  * ethnl_init_reply_data() - Initialize reply data for GET request
 275  * @reply_data: pointer to embedded struct ethnl_reply_data
 276  * @ops:        instance of struct ethnl_request_ops describing the layout
 277  * @dev:        network device to initialize the reply for
 278  *
 279  * Fills the reply data part with zeros and sets the dev member. Must be called
 280  * before calling the ->fill_reply() callback (for each iteration when handling
 281  * dump requests).
 282  */
 283 static void ethnl_init_reply_data(struct ethnl_reply_data *reply_data,
 284                                   const struct ethnl_request_ops *ops,
 285                                   struct net_device *dev)
 286 {
 287         memset(reply_data, 0, ops->reply_data_size);
 288         reply_data->dev = dev;
 289 }
 290
 291 /* default ->doit() handler for GET type requests */
 292 static int ethnl_default_doit(struct sk_buff *skb, struct genl_info *info)
 293 {
 294         struct ethnl_reply_data *reply_data = NULL;
 295         struct ethnl_req_info *req_info = NULL;
 296         const u8 cmd = info->genlhdr->cmd;
 297         const struct ethnl_request_ops *ops;
 298         struct sk_buff *rskb;
 299         void *reply_payload;
 300         int reply_len;
 301         int ret;
 302
 303         ops = ethnl_default_requests[cmd];
 304         if (WARN_ONCE(!ops, "cmd %u has no ethnl_request_ops\n", cmd))
 305                 return -EOPNOTSUPP;
 306         req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
 307         if (!req_info)
 308                 return -ENOMEM;
 309         reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
 310         if (!reply_data) {
 311                 kfree(req_info);
 312                 return -ENOMEM;
 313         }
 314
 315         ret = ethnl_default_parse(req_info, info->nlhdr, genl_info_net(info), ops,
 316                                   info->extack, !ops->allow_nodev_do);
 317         if (ret < 0)
 318                 goto err_dev;
 319         ethnl_init_reply_data(reply_data, ops, req_info->dev);
 320
 321         rtnl_lock();
 322         ret = ops->prepare_data(req_info, reply_data, info);
 323         rtnl_unlock();
 324         if (ret < 0)
 325                 goto err_cleanup;
 326         ret = ops->reply_size(req_info, reply_data);
 327         if (ret < 0)
 328                 goto err_cleanup;
 329         reply_len = ret;
 330         ret = -ENOMEM;
 331         rskb = ethnl_reply_init(reply_len, req_info->dev, ops->reply_cmd,
 332                                 ops->hdr_attr, info, &reply_payload);
 333         if (!rskb)
 334                 goto err_cleanup;
 335         ret = ops->fill_reply(rskb, req_info, reply_data);
 336         if (ret < 0)
 337                 goto err_msg;
 338         if (ops->cleanup_data)
 339                 ops->cleanup_data(reply_data);
 340
 341         genlmsg_end(rskb, reply_payload);
 342         if (req_info->dev)
 343                 dev_put(req_info->dev);
 344         kfree(reply_data);
 345         kfree(req_info);
 346         return genlmsg_reply(rskb, info);
 347
 348 err_msg:
 349         WARN_ONCE(ret == -EMSGSIZE, "calculated message payload length (%d) not sufficient\n", reply_len);
 350         nlmsg_free(rskb);
 351 err_cleanup:
 352         if (ops->cleanup_data)
 353                 ops->cleanup_data(reply_data);
 354 err_dev:
 355         if (req_info->dev)
 356                 dev_put(req_info->dev);
 357         kfree(reply_data);
 358         kfree(req_info);
 359         return ret;
 360 }
 361
 362 static int ethnl_default_dump_one(struct sk_buff *skb, struct net_device *dev,
 363                                   const struct ethnl_dump_ctx *ctx)
 364 {
 365         int ret;
 366
 367         ethnl_init_reply_data(ctx->reply_data, ctx->ops, dev);
 368         rtnl_lock();
 369         ret = ctx->ops->prepare_data(ctx->req_info, ctx->reply_data, NULL);
 370         rtnl_unlock();
 371         if (ret < 0)
 372                 goto out;
 373         ret = ethnl_fill_reply_header(skb, dev, ctx->ops->hdr_attr);
 374         if (ret < 0)
 375                 goto out;
 376         ret = ctx->ops->fill_reply(skb, ctx->req_info, ctx->reply_data);
 377
 378 out:
 379         if (ctx->ops->cleanup_data)
 380                 ctx->ops->cleanup_data(ctx->reply_data);
 381         ctx->reply_data->dev = NULL;
 382         return ret;
 383 }
 384
 385 /* Default ->dumpit() handler for GET requests. Device iteration copied from
 386  * rtnl_dump_ifinfo(); we have to be more careful about device hashtable
 387  * persistence as we cannot guarantee to hold RTNL lock through the whole
 388  * function as rtnetnlink does.
 389  */
 390 static int ethnl_default_dumpit(struct sk_buff *skb,
 391                                 struct netlink_callback *cb)
 392 {
 393         struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
 394         struct net *net = sock_net(skb->sk);
 395         int s_idx = ctx->pos_idx;
 396         int h, idx = 0;
 397         int ret = 0;
 398         void *ehdr;
 399
 400         rtnl_lock();
 401         for (h = ctx->pos_hash; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 402                 struct hlist_head *head;
 403                 struct net_device *dev;
 404                 unsigned int seq;
 405
 406                 head = &net->dev_index_head[h];
 407
 408 restart_chain:
 409                 seq = net->dev_base_seq;
 410                 cb->seq = seq;
 411                 idx = 0;
 412                 hlist_for_each_entry(dev, head, index_hlist) {
 413                         if (idx < s_idx)
 414                                 goto cont;
 415                         dev_hold(dev);
 416                         rtnl_unlock();
 417
 418                         ehdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
 419                                            cb->nlh->nlmsg_seq,
 420                                            &ethtool_genl_family, 0,
 421                                            ctx->ops->reply_cmd);
 422                         if (!ehdr) {
 423                                 dev_put(dev);
 424                                 ret = -EMSGSIZE;
 425                                 goto out;
 426                         }
 427                         ret = ethnl_default_dump_one(skb, dev, ctx);
 428                         dev_put(dev);
 429                         if (ret < 0) {
 430                                 genlmsg_cancel(skb, ehdr);
 431                                 if (ret == -EOPNOTSUPP)
 432                                         goto lock_and_cont;
 433                                 if (likely(skb->len))
 434                                         ret = skb->len;
 435                                 goto out;
 436                         }
 437                         genlmsg_end(skb, ehdr);
 438 lock_and_cont:
 439                         rtnl_lock();
 440                         if (net->dev_base_seq != seq) {
 441                                 s_idx = idx + 1;
 442                                 goto restart_chain;
 443                         }
 444 cont:
 445                         idx++;
 446                 }
 447
 448         }
 449         rtnl_unlock();
 450
 451 out:
 452         ctx->pos_hash = h;
 453         ctx->pos_idx = idx;
 454         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 455
 456         return ret;
 457 }
 458
 459 /* generic ->start() handler for GET requests */
 460 static int ethnl_default_start(struct netlink_callback *cb)
 461 {
 462         struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
 463         struct ethnl_reply_data *reply_data;
 464         const struct ethnl_request_ops *ops;
 465         struct ethnl_req_info *req_info;
 466         struct genlmsghdr *ghdr;
 467         int ret;
 468
 469         BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
 470
 471         ghdr = nlmsg_data(cb->nlh);
 472         ops = ethnl_default_requests[ghdr->cmd];
 473         if (WARN_ONCE(!ops, "cmd %u has no ethnl_request_ops\n", ghdr->cmd))
 474                 return -EOPNOTSUPP;
 475         req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
 476         if (!req_info)
 477                 return -ENOMEM;
 478         reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
 479         if (!reply_data) {
 480                 ret = -ENOMEM;
 481                 goto free_req_info;
 482         }
 483
 484         ret = ethnl_default_parse(req_info, cb->nlh, sock_net(cb->skb->sk), ops,
 485                                   cb->extack, false);
 486         if (req_info->dev) {
 487                 /* We ignore device specification in dump requests but as the
 488                  * same parser as for non-dump (doit) requests is used, it
 489                  * would take reference to the device if it finds one
 490                  */
 491                 dev_put(req_info->dev);
 492                 req_info->dev = NULL;
 493         }
 494         if (ret < 0)
 495                 goto free_reply_data;
 496
 497         ctx->ops = ops;
 498         ctx->req_info = req_info;
 499         ctx->reply_data = reply_data;
 500         ctx->pos_hash = 0;
 501         ctx->pos_idx = 0;
 502
 503         return 0;
 504
 505 free_reply_data:
 506         kfree(reply_data);
 507 free_req_info:
 508         kfree(req_info);
 509
 510         return ret;
 511 }
 512
 513 /* default ->done() handler for GET requests */
 514 static int ethnl_default_done(struct netlink_callback *cb)
 515 {
 516         struct ethnl_dump_ctx *ctx = ethnl_dump_context(cb);
 517
 518         kfree(ctx->reply_data);
 519         kfree(ctx->req_info);
 520
 521         return 0;
 522 }
 523
 524 static const struct ethnl_request_ops *
 525 ethnl_default_notify_ops[ETHTOOL_MSG_KERNEL_MAX + 1] = {
 526         [ETHTOOL_MSG_LINKINFO_NTF]      = &ethnl_linkinfo_request_ops,
 527         [ETHTOOL_MSG_LINKMODES_NTF]     = &ethnl_linkmodes_request_ops,
 528         [ETHTOOL_MSG_DEBUG_NTF]         = &ethnl_debug_request_ops,
 529         [ETHTOOL_MSG_WOL_NTF]           = &ethnl_wol_request_ops,
 530 };
 531
 532 /* default notification handler */
 533 static void ethnl_default_notify(struct net_device *dev, unsigned int cmd,
 534                                  const void *data)
 535 {
 536         struct ethnl_reply_data *reply_data;
 537         const struct ethnl_request_ops *ops;
 538         struct ethnl_req_info *req_info;
 539         struct sk_buff *skb;
 540         void *reply_payload;
 541         int reply_len;
 542         int ret;
 543
 544         if (WARN_ONCE(cmd > ETHTOOL_MSG_KERNEL_MAX ||
 545                       !ethnl_default_notify_ops[cmd],
 546                       "unexpected notification type %u\n", cmd))
 547                 return;
 548         ops = ethnl_default_notify_ops[cmd];
 549         req_info = kzalloc(ops->req_info_size, GFP_KERNEL);
 550         if (!req_info)
 551                 return;
 552         reply_data = kmalloc(ops->reply_data_size, GFP_KERNEL);
 553         if (!reply_data) {
 554                 kfree(req_info);
 555                 return;
 556         }
 557
 558         req_info->dev = dev;
 559         req_info->flags |= ETHTOOL_FLAG_COMPACT_BITSETS;
 560
 561         ethnl_init_reply_data(reply_data, ops, dev);
 562         ret = ops->prepare_data(req_info, reply_data, NULL);
 563         if (ret < 0)
 564                 goto err_cleanup;
 565         ret = ops->reply_size(req_info, reply_data);
 566         if (ret < 0)
 567                 goto err_cleanup;
 568         reply_len = ret;
 569         ret = -ENOMEM;
 570         skb = genlmsg_new(reply_len, GFP_KERNEL);
 571         if (!skb)
 572                 goto err_cleanup;
 573         reply_payload = ethnl_bcastmsg_put(skb, cmd);
 574         if (!reply_payload)
 575                 goto err_skb;
 576         ret = ethnl_fill_reply_header(skb, dev, ops->hdr_attr);
 577         if (ret < 0)
 578                 goto err_msg;
 579         ret = ops->fill_reply(skb, req_info, reply_data);
 580         if (ret < 0)
 581                 goto err_msg;
 582         if (ops->cleanup_data)
 583                 ops->cleanup_data(reply_data);
 584
 585         genlmsg_end(skb, reply_payload);
 586         kfree(reply_data);
 587         kfree(req_info);
 588         ethnl_multicast(skb, dev);
 589         return;
 590
 591 err_msg:
 592         WARN_ONCE(ret == -EMSGSIZE,
 593                   "calculated message payload length (%d) not sufficient\n",
 594                   reply_len);
 595 err_skb:
 596         nlmsg_free(skb);
 597 err_cleanup:
 598         if (ops->cleanup_data)
 599                 ops->cleanup_data(reply_data);
 600         kfree(reply_data);
 601         kfree(req_info);
 602         return;
 603 }
 604
 605 /* notifications */
 606
 607 typedef void (*ethnl_notify_handler_t)(struct net_device *dev, unsigned int cmd,
 608                                        const void *data);
 609
 610 static const ethnl_notify_handler_t ethnl_notify_handlers[] = {
 611         [ETHTOOL_MSG_LINKINFO_NTF]      = ethnl_default_notify,
 612         [ETHTOOL_MSG_LINKMODES_NTF]     = ethnl_default_notify,
 613         [ETHTOOL_MSG_DEBUG_NTF]         = ethnl_default_notify,
 614         [ETHTOOL_MSG_WOL_NTF]           = ethnl_default_notify,
 615 };
 616
 617 void ethtool_notify(struct net_device *dev, unsigned int cmd, const void *data)
 618 {
 619         if (unlikely(!ethnl_ok))
 620                 return;
 621         ASSERT_RTNL();
 622
 623         if (likely(cmd < ARRAY_SIZE(ethnl_notify_handlers) &&
 624                    ethnl_notify_handlers[cmd]))
 625                 ethnl_notify_handlers[cmd](dev, cmd, data);
 626         else
 627                 WARN_ONCE(1, "notification %u not implemented (dev=%s)\n",
 628                           cmd, netdev_name(dev));
 629 }
 630 EXPORT_SYMBOL(ethtool_notify);
 631
 632 /* genetlink setup */
 633
 634 static const struct genl_ops ethtool_genl_ops[] = {
 635         {
 636                 .cmd    = ETHTOOL_MSG_STRSET_GET,
 637                 .doit   = ethnl_default_doit,
 638                 .start  = ethnl_default_start,
 639                 .dumpit = ethnl_default_dumpit,
 640                 .done   = ethnl_default_done,
 641         },
 642         {
 643                 .cmd    = ETHTOOL_MSG_LINKINFO_GET,
 644                 .doit   = ethnl_default_doit,
 645                 .start  = ethnl_default_start,
 646                 .dumpit = ethnl_default_dumpit,
 647                 .done   = ethnl_default_done,
 648         },
 649         {
 650                 .cmd    = ETHTOOL_MSG_LINKINFO_SET,
 651                 .flags  = GENL_UNS_ADMIN_PERM,
 652                 .doit   = ethnl_set_linkinfo,
 653         },
 654         {
 655                 .cmd    = ETHTOOL_MSG_LINKMODES_GET,
 656                 .doit   = ethnl_default_doit,
 657                 .start  = ethnl_default_start,
 658                 .dumpit = ethnl_default_dumpit,
 659                 .done   = ethnl_default_done,
 660         },
 661         {
 662                 .cmd    = ETHTOOL_MSG_LINKMODES_SET,
 663                 .flags  = GENL_UNS_ADMIN_PERM,
 664                 .doit   = ethnl_set_linkmodes,
 665         },
 666         {
 667                 .cmd    = ETHTOOL_MSG_LINKSTATE_GET,
 668                 .doit   = ethnl_default_doit,
 669                 .start  = ethnl_default_start,
 670                 .dumpit = ethnl_default_dumpit,
 671                 .done   = ethnl_default_done,
 672         },
 673         {
 674                 .cmd    = ETHTOOL_MSG_DEBUG_GET,
 675                 .doit   = ethnl_default_doit,
 676                 .start  = ethnl_default_start,
 677                 .dumpit = ethnl_default_dumpit,
 678                 .done   = ethnl_default_done,
 679         },
 680         {
 681                 .cmd    = ETHTOOL_MSG_DEBUG_SET,
 682                 .flags  = GENL_UNS_ADMIN_PERM,
 683                 .doit   = ethnl_set_debug,
 684         },
 685         {
 686                 .cmd    = ETHTOOL_MSG_WOL_GET,
 687                 .flags  = GENL_UNS_ADMIN_PERM,
 688                 .doit   = ethnl_default_doit,
 689                 .start  = ethnl_default_start,
 690                 .dumpit = ethnl_default_dumpit,
 691                 .done   = ethnl_default_done,
 692         },
 693         {
 694                 .cmd    = ETHTOOL_MSG_WOL_SET,
 695                 .flags  = GENL_UNS_ADMIN_PERM,
 696                 .doit   = ethnl_set_wol,
 697         },
 698 };
 699
 700 static const struct genl_multicast_group ethtool_nl_mcgrps[] = {
 701         [ETHNL_MCGRP_MONITOR] = { .name = ETHTOOL_MCGRP_MONITOR_NAME },
 702 };
 703
 704 static struct genl_family ethtool_genl_family = {
 705         .name           = ETHTOOL_GENL_NAME,
 706         .version        = ETHTOOL_GENL_VERSION,
 707         .netnsok        = true,
 708         .parallel_ops   = true,
 709         .ops            = ethtool_genl_ops,
 710         .n_ops          = ARRAY_SIZE(ethtool_genl_ops),
 711         .mcgrps         = ethtool_nl_mcgrps,
 712         .n_mcgrps       = ARRAY_SIZE(ethtool_nl_mcgrps),
 713 };
 714
 715 /* module setup */
 716
 717 static int __init ethnl_init(void)
 718 {
 719         int ret;
 720
 721         ret = genl_register_family(&ethtool_genl_family);
 722         if (WARN(ret < 0, "ethtool: genetlink family registration failed"))
 723                 return ret;
 724         ethnl_ok = true;
 725
 726         return 0;
 727 }
 728
 729 subsys_initcall(ethnl_init);